30. Frank didn’t know the answer to the ______ math question, so he turned to the smartest
student in his class for help.
(A)dynamic
(B)complicated
(C)residential
(D)optimistic
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統計: A(18), B(170), C(4), D(15), E(0) #2928733
統計: A(18), B(170), C(4), D(15), E(0) #2928733